function f(a, p) {
    p || a === undefined || a === null;
    p || a === undefined || a !== null;
    p || a !== undefined || a === null;
    p || a !== undefined || a !== null;
    p || (a === undefined && a === null);
    p || (a === undefined && a !== null);
    p || (a !== undefined && a === null);
    p || (a !== undefined && a !== null);
}
